4020009 has 48 divisors (see below), whose sum is σ = 6894720. Its totient is φ = 2069760.

The previous prime is 4019993. The next prime is 4020011. The reversal of 4020009 is 9000204.

It is not a de Polignac number, because 4020009 - 2⁴ = 4019993 is a prime.

4020009 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 4020009.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4020409) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 98029 + ... + 98069.

It is an arithmetic number, because the mean of its divisors is an integer number (143640).

Almost surely, 2^4020009 is an apocalyptic number.

4020009 is a gapful number since it is divisible by the number (49) formed by its first and last digit.

It is an amenable number.

4020009 is a deficient number, since it is larger than the sum of its proper divisors (2874711).

4020009 is a wasteful number, since it uses less digits than its factorization.

4020009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110 (or 103 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 4020009 is about 2004.9960099711. The cubic root of 4020009 is about 159.0043509746.

The spelling of 4020009 in words is "four million, twenty thousand, nine".